Test

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HelloWithInheritance

import Foundation
import ServiceStack

public class HelloWithInheritance : HelloBase
{
    public var name:String

    required public init(){ super.init() }

    private enum CodingKeys : String, CodingKey {
        case name
    }

    required public init(from decoder: Decoder) throws {
        try super.init(from: decoder)
        let container = try decoder.container(keyedBy: CodingKeys.self)
        name = try container.decodeIfPresent(String.self, forKey: .name)
    }

    public override func encode(to encoder: Encoder) throws {
        try super.encode(to: encoder)
        var container = encoder.container(keyedBy: CodingKeys.self)
        if name != nil { try container.encode(name, forKey: .name) }
    }
}

public class HelloBase : Codable
{
    public var id:Int

    required public init(){}
}

public class HelloWithInheritanceResponse : HelloResponseBase
{
    public var result:String

    required public init(){ super.init() }

    private enum CodingKeys : String, CodingKey {
        case result
    }

    required public init(from decoder: Decoder) throws {
        try super.init(from: decoder)
        let container = try decoder.container(keyedBy: CodingKeys.self)
        result = try container.decodeIfPresent(String.self, forKey: .result)
    }

    public override func encode(to encoder: Encoder) throws {
        try super.encode(to: encoder)
        var container = encoder.container(keyedBy: CodingKeys.self)
        if result != nil { try container.encode(result, forKey: .result) }
    }
}

public class HelloResponseBase : Codable
{
    public var refId:Int

    required public init(){}
}

Swift HelloWithInheritance DTOs

POST /jsv/reply/HelloWithInheritance HTTP/1.1 
Host: test.servicestack.net 
Accept: text/jsv
Content-Type: text/jsv
Content-Length: length

{
	name: String,
	id: 0
}

HTTP/1.1 200 OK
Content-Type: text/jsv
Content-Length: length

{
	result: String,
	refId: 0
}